Telephoto optical imaging system and zoom camera apparatus

ABSTRACT

The present disclosure discloses a telephoto optical imaging system and zoom camera apparatus. The telephoto optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power, a second lens having negative refractive power, an optical path turning prism, and a triangular prism. A total effective focal length F1 of the telephoto optical imaging system may satisfy F1&gt;40 mm. The zoom camera apparatus includes the telephoto optical imaging system and a short-focus optical imaging system arranged in parallel with the telephoto optical imaging system. A total effective focal length F1 of the telephoto optical imaging system and a total effective focal length F2 of the short-focus optical imaging system satisfy F1/F2&gt;5.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims benefit of priority to Chinese PatentApplication No. 201911416683.8 filed on Dec. 31, 2019 before the ChinaNational Intellectual Property Administration, the entire disclosure ofwhich is incorporated herein by reference in its entity.

TECHNICAL FIELD

The present disclosure relates to the field of optical elements, andmore specifically, relates to a telephoto optical imaging system and azoom camera apparatus.

BACKGROUND

Currently, the requirements for imaging functions of portable electronicdevices are becoming higher and higher, and the camera apparatuses ofmobile phones are developing in the aspects of high resolution, largefield-of-view, light weight and versatility. That requires the opticalimaging system in the camera apparatus has multiple characteristics suchas large aperture, long focal length, wide field-of-view, compactstructure, high image quality and low distortion. On the other hand,since the portable electronic device is expected to have a smaller size,the size of the optical imaging system provided on the electronic deviceis also limited.

In order to meet these high requirements, on the one hand, the opticalimaging system of mobile phone camera apparatuses is becoming more andmore complex, from the initial imaging system with four or five lensesto the current imaging system with seven or eight lenses. The increasein the number of lenses in the optical imaging system makes theoptimization in the early stage and the manufacturing in the later stagemore complicated and difficult. On the other hand, the mobile phoneindustry tends to employ multiple sets of optical imaging systems formulti-shots. Multiple sets of optical imaging systems highlightdifferent optical characteristics, which usually include a telephotooptical imaging system with a relatively long focal length. Due to thelimitation of the thickness of the mobile phone, the opticalcharacteristics of the telephoto optical imaging system are limited,which limits the imaging effects of the mobile phone, such as backgroundblur and object magnification.

Therefore, how to achieve an optical imaging system with good opticalcharacteristics and capable of meeting the requirements ofminiaturization is a problem to be solved urgently. In order to meet therequirements of miniaturization and imaging requirements, an opticalimaging system that can simultaneously satisfy the characteristics ofminiaturization, compact structure, ultra-long focal length and highimage quality is required.

SUMMARY

In one aspect, the present disclosure provides a telephoto opticalimaging system which includes, sequentially from an object side to animage side along an optical axis, a first lens having positiverefractive power, a second lens having negative refractive power, anoptical path turning prism, and a triangular prism. An incident surfaceof the optical path turning prism is perpendicular to an axis of thesecond lens, and an exit surface of the optical path turning prism isperpendicular to the incident surface of the optical path turning prism.An imaging light incident to the optical path turning prism along theoptical axis is reflected sequentially at a first optical path turningsurface of the optical path turning prism and a second optical pathturning surface of the optical path turning prism and emittedperpendicularly from the exit surface of the optical path turning prism.The light perpendicularly emitted from the exit surface of the opticalpath turning prism is reflected at a reflecting surface of thetriangular prism and deflected by 90° with a deflection direction towardthe image side. At least one of an object-side surface of the first lensto an image-side surface of the second lens is aspheric. In oneembodiment, a total effective focal length F1 of the telephoto opticalimaging system may satisfy F1>40 mm.

In one embodiment, an equivalent distance TL in the air for a pathdistance of a light traveling along the optical axis from theobject-side surface of the first lens to an imaging plane of thetelephoto optical imaging system, and a distance T from the object-sidesurface of the first lens to the imaging plane of the telephoto opticalimaging system in a normal direction of the imaging plane of thetelephoto optical imaging system may satisfy 3.0<TL/T<4.0.

In one embodiment, a distance T from the object-side surface of thefirst lens to an imaging plane of the telephoto optical imaging systemin a normal direction of the imaging plane of the telephoto opticalimaging system and the total effective focal length F1 of the telephotooptical imaging system may satisfy T/F1<0.6.

In one embodiment, the telephoto optical imaging system has a height Hin a direction perpendicular to the exit surface of the optical pathturning prism, and the height H of the telephoto optical imaging systemand a maximum effective diameter D1 of the first lens may satisfy2.5<H/D1<3.5.

In one embodiment, an angle β between the second optical path turningsurface of the optical path turning prism and the incident surface ofthe optical path turning prism, and an effective diameter h of theincident surface of the optical path turning prism may satisfy 0.2≤|tanβ|/h≤0.3.

In one embodiment, an effective diameter h of the incident surface ofthe optical path turning prism and a maximum effective diameter D2 ofthe second lens may satisfy 1.0<h/D2<1.5.

In one embodiment, the total effective focal length F1 of the telephotooptical imaging system and an effective focal length f1 of the firstlens may satisfy 3.0<F1/f1<4.0.

In one embodiment, the total effective focal length F1 of the telephotooptical imaging system and an effective focal length f2 of the secondlens may satisfy −3.5<F1/f2<−3.0.

In one embodiment, an entrance pupil diameter EPD of the telephotooptical imaging system and half of a diagonal length ImgH of aneffective pixel area on an imaging plane of the telephoto opticalimaging system may satisfy 2.0<EPD/ImgH<3.0.

In one embodiment, a refractive index N1 of the first lens and arefractive index N2 of the second lens may satisfy 1.65<(N1+N2)/2<1.80.

In one embodiment, a spaced interval Tp along the optical axis betweenthe exit surface of the optical path turning prism and the incidentsurface of the triangular prism may satisfy 2.0<Tp<3.0.

In a second aspect, the present disclosure further provides a telephotooptical imaging system which includes, sequentially from an object sideto an image side along an optical axis, a first lens having positiverefractive power, a second lens having negative refractive power, anoptical path turning prism, and a triangular prism. An incident surfaceof the optical path turning prism is perpendicular to an axis of thesecond lens, and an exit surface of the optical path turning prism isperpendicular to the incident surface of the optical path turning prism.An imaging light incident to the optical path turning prism along theoptical axis is reflected sequentially at a first optical path turningsurface of the optical path turning prism and a second optical pathturning surface of the optical path turning prism and emittedperpendicularly from the exit surface of the optical path turning prism.The light perpendicularly emitted from the exit surface of the opticalpath turning prism is reflected at a reflecting surface of thetriangular prism and deflected by 90° with a deflection directiontoward. At least one of an object-side surface of the first lens to animage-side surface of the second lens is aspheric. An equivalentdistance TL in the air for a path distance of a light traveling alongthe optical axis from the object-side surface of the first lens to animaging plane of the telephoto optical imaging system, and a distance Tfrom the object-side surface of the first lens to the imaging plane ofthe telephoto optical imaging system in a normal direction of theimaging plane of the telephoto optical imaging system satisfy3.0<TL/T<4.0.

The present disclosure employs two lenses and two prisms. By setting theprism, the light traveling direction is folded back relative to thearrangement direction of the multiple lenses, so that the size of theoptical imaging lens assembly in the light incident direction isreduced. In addition, the use of the optical path turning prism reducesthe loss of light energy in the system. At the same time, the aboveoptical imaging system has at least one beneficial effect, such asultra-long effective focal length, high image quality, small systemsize, simple structure and compact structure and the like, by rationallyconfiguring the refractive power, the surface shape, the centerthickness of each lens, and the on-axis spaced interval between thelenses and the like.

In a third aspect, the present disclosure provides a zoom cameraapparatus which includes, the foregoing telephoto optical imagingsystem; and a short-focus optical imaging system arranged in parallelwith the telephoto optical imaging system. A total effective focallength F1 of the telephoto optical imaging system and a total effectivefocal length F2 of the short-focus optical imaging system may satisfyF1/F2>5.

The zoom camera apparatus provided by the present disclosure has alarger zoom range by providing two optical imaging systems, and has atleast one beneficial effect, such as ultra-long effective focal length,high image quality, small system size, simple structure and compactstructure and the like.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objects, and advantages of the present disclosure willbecome more apparent from the following detailed description of thenon-limiting embodiments with reference to the accompanying drawings. Inthe drawings:

FIG. 1 illustrates a schematic structural view of a telephoto opticalimaging system according to the present disclosure;

FIG. 2 illustrates a schematic structural view of a telephoto opticalimaging system according to example 1 of the present disclosure;

FIGS. 3A to 3D illustrate a longitudinal aberration curve, an astigmaticcurve, a distortion curve, and a lateral color curve of the opticalimaging system of the example 1, respectively;

FIG. 4 illustrates a schematic structural view of a telephoto opticalimaging system according to example 2 of the present disclosure;

FIGS. 5A to 5D illustrate a longitudinal aberration curve, an astigmaticcurve, a distortion curve, and a lateral color curve of the opticalimaging system of the example 2, respectively;

FIG. 6 illustrates a schematic structural view of a telephoto opticalimaging system according to example 3 of the present disclosure;

FIGS. 7A to 7D illustrate a longitudinal aberration curve, an astigmaticcurve, a distortion curve, and a lateral color curve of the opticalimaging system of the example 3, respectively;

FIG. 8 illustrates a schematic structural view of a short-focus opticalimaging system according to example 4 of the present disclosure;

FIGS. 9A to 9D illustrate a longitudinal aberration curve, an astigmaticcurve, a distortion curve, and a lateral color curve of the opticalimaging system of the example 4, respectively;

FIG. 10 illustrates a schematic structural view of a short-focus opticalimaging system according to example 5 of the present disclosure; and

FIGS. 11A to 11D illustrate a longitudinal aberration curve, anastigmatic curve, a distortion curve, and a lateral color curve of theoptical imaging system of the example 5, respectively.

DETAILED DESCRIPTION OF EMBODIMENTS

For a better understanding of the present disclosure, various aspects ofthe present disclosure will be described in more detail with referenceto the accompanying drawings. It should be understood that the detaileddescription is merely illustrative of the exemplary embodiments of thepresent disclosure and is not intended to limit the scope of the presentdisclosure in any way. Throughout the specification, the same referencenumerals refer to the same elements. The expression “and/or” includesany and all combinations of one or more of the associated listed items.

It should be noted that in the present specification, the expressionssuch as first, second, third are used merely for distinguishing onefeature from another, without indicating any limitation on the features.Thus, a first lens discussed below may also be referred to as a secondlens or a third lens without departing from the teachings of the presentdisclosure.

In the accompanying drawings, the thickness, size and shape of the lenshave been somewhat exaggerated for the convenience of explanation. Inparticular, shapes of spherical surfaces or aspheric surfaces shown inthe accompanying drawings are shown by way of example. That is, shapesof the spherical surfaces or the aspheric surfaces are not limited tothe shapes of the spherical surfaces or the aspheric surfaces shown inthe accompanying drawings. The accompanying drawings are merelyillustrative and not strictly drawn to scale.

Herein, the paraxial area refers to an area near the optical axis. If asurface of a lens is a convex surface and the position of the convex isnot defined, it indicates that the surface of the lens is convex atleast in the paraxial region; and if a surface of a lens is a concavesurface and the position of the concave is not defined, it indicatesthat the surface of the lens is concave at least in the paraxial region.In each lens, the surface closest to the object is referred to as anobject-side surface of the lens, and the surface closest to the imagingplane is referred to as an image-side surface of the lens.

It should be further understood that the terms “comprising,”“including,” “having,” “containing” and/or “contain,” when used in thespecification, specify the presence of stated features, elements and/orcomponents, but do not exclude the presence or addition of one or moreother features, elements, components and/or combinations thereof. Inaddition, expressions, such as “at least one of,” when preceding a listof features, modify the entire list of features rather than anindividual element in the list. Further, the use of “may,” whendescribing embodiments of the present disclosure, refers to “one or moreembodiments of the present disclosure.” Also, the term “exemplary” isintended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by thoseof ordinary skill in the art to which the present disclosure belongs. Itwill be further understood that terms, such as those defined in commonlyused dictionaries, should be interpreted as having a meaning that isconsistent with the meaning in the context of the relevant art and willnot be interpreted in an idealized or overly formal sense, unlessexpressly so defined herein.

It should also be noted that, the examples in the present disclosure andthe features in the examples may be combined with each other on anon-conflict basis. The present disclosure will be described in detailbelow with reference to the accompanying drawings and in combinationwith the examples.

The features, principles, and other aspects of the present disclosureare described in detail below.

Referring to FIG. 1, a telephoto optical imaging system according to anexemplary embodiment of the present disclosure may include a first lensE100, a second lens E200, an optical path turning prism P1, and atriangular prism P2. The two lenses are arranged sequentially from anobject side to an image side along an optical axis. There may be an airinterval between two adjacent lenses, between two adjacent prisms, andbetween the lens and the prism. The telephoto optical imaging system mayinclude a stop arranged in an appropriate position. Optionally, thetelephoto optical imaging system may further include an optical filterfor correcting the color deviation and/or a protective glass forprotecting the photosensitive element located on an imaging plane.

In an exemplary embodiment, the first lens E100 has positive refractivepower, and the second lens E200 has negative refractive power. Thelow-order aberrations of the system are effectively compensated byrationally controlling the positive or negative distribution of therefractive power and the surface curvature of each component in thesystem.

In an exemplary embodiment, the optical path turning prism P1 may atleast include an incident surface S105, a first optical path turningsurface S106, a second optical path turning surface S107, and an exitsurface S108, which are sequentially arranged along the optical axis.The triangular prism P2 may include at least an incident surface S109, areflecting surface S110, and an exit surface S111. The optical axisturns twice in the optical path turning prism P1, and the optical axisturns once in the triangular prism P2.

The incident surface S105 of the optical path turning prism P1 isperpendicular to an axis of the second lens E200. The exit surface S108of the optical path turning prism P1 is perpendicular to the incidentsurface S105 of the optical path turning prism P1. An imaging lightincident to the optical path turning prism P1 along the optical axis isreflected sequentially at the first optical path turning surface S106 ofthe optical path turning prism P1 and the second optical path turningsurface S107 of the optical path turning prism P1, and emittedperpendicularly from the exit surface S108 of the optical path turningprism P1. The light perpendicularly emitted from the exit surface S108of the optical path turning prism P1 is reflected at the reflectingsurface S110 of the triangular prism P2 and deflected by 90° with thedeflection direction toward the image side. The use of the optical pathturning prism P1 reduces the loss of light energy in the telephotooptical imaging system, so that the telephoto optical imaging system hasthe characteristics of small size and compact structure.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: F1>40 mm, where F1 is atotal effective focal length of the telephoto optical imaging system.More specifically, F1 may satisfy: F1>45 mm By constraining the totaleffective focal length of the telephoto optical imaging system, thetelephoto optical imaging system has an ultra-long focal length.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 3.0<TL/T<4.0, where TLis an equivalent distance in the air for a path distance of a lighttraveling along the optical axis from an object-side surface S101 of thefirst lens E100 to an imaging plane S112 of the telephoto opticalimaging system, and T is a distance from the object-side surface S101 ofthe first lens E100 to the imaging plane S112 of the telephoto opticalimaging system in a normal direction of the imaging plane S112 of thetelephoto optical imaging system. More specifically, TL and T maysatisfy: 3.4<TL/T<3.5. By controlling the ratio of the equivalentdistance in the air for the total optical length of the telephotooptical imaging system to the lens structure length, the length of thetelephoto optical imaging system may be controlled in the normaldirection of the imaging plane S112 (that is, in the horizontaldirection during usual use), which may prevent the structural size ofthe telephoto optical imaging system from being too large. This maybetter satisfy the market's requirements for small size and compactstructure of portable electronic equipment.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: T/F1<0.6, where T is adistance from an object-side surface S101 of the first lens E100 to animaging plane S112 of the telephoto optical imaging system in a normaldirection of the imaging plane S112 of the telephoto optical imagingsystem, and F1 is a total effective focal length of the telephotooptical imaging system. More specifically, T and F1 may satisfy:T/F1<0.5. By constraining the ratio of the structural length of thetelephoto optical imaging system to the total effective focal lengththereof, it is possible to have an ultra-long effective focal lengthwhile ensuring that the telephoto optical imaging system has a smallersize in the horizontal direction as shown in the figure.

In an exemplary embodiment, the optical path turning prism P1 is apentaprism, and an angle between the first optical path turning surfaceS106 and the second optical path turning surface S107 is small. Byproviding a prism surface, the size of the optical path turning prism P1in the vertical direction may be relatively small.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 2.5<H/D1<3.5, where His a height in a vertical direction of the telephoto optical imagingsystem as shown in the figure, and D1 is a maximum effective diameter ofthe first lens P1. The vertical direction is also the direction of thesection of the optical axis between the second optical path turningsurface S107 of the optical path turning prism P1 and the reflectingsurface S110 of the triangular prism P2. More specifically, H and D1 maysatisfy: 2.6<H/D1<3.2. By controlling the ratio of the height of thetelephoto optical imaging system in the vertical direction to themaximum effective diameter of the first lens P1, it may effectivelyensure that the structural size of the telephoto optical imaging systemwill not be too large, so that the portable electronic device installedwith the telephoto optical imaging system may satisfy the market'srequirements for small size and compact structure.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 0.2≤|tan β|/h≤0.3,where β is an angle between the second optical path turning surface S107of the optical path turning prism P1 and the incident surface S105 ofthe optical path turning prism P1, and h is an effective diameter of theincident surface S105 of the optical path turning prism P1. The h may beequivalent to the effective height of the incident surface S105 in thevertical direction. More specifically, 13 and h may satisfy: 0.21≤|tanβ|/h≤0.28. By matching the angle between the second optical path turningsurface S107 and the incident surface S105 with the effective diameterof the incident surface S105, the direction of the imaging light in theoptical path turning prism P1 may be restricted, so that the telephotooptical imaging system has a relatively long effective focal length.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 1.0<h/D2<1.5, where his an effective diameter of the incident surface S105 of the opticalpath turning prism P1, and D2 is a maximum effective diameter of thesecond lens E200. More specifically, h and D2 may satisfy:1.2<h/D2<1.45. By controlling the ratio of the effective diameter of theincident surface S105 to the maximum effective diameter of the secondlens E200, it is beneficial to better control the overall size of thetelephoto optical imaging system, so that the telephoto optical imagingsystem satisfies the requirements of structural miniaturization whilemeeting high-requirement optical performance.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 3.0<F1/f2<4.0, where F1is a total effective focal length of the telephoto optical imagingsystem, and f1 is an effective focal length of the first lens E100. Morespecifically, F1 and f1 may satisfy: 3.48<F1/f1<3.55. By controlling theratio of the total effective focal length to the effective focal lengthof the first lens E100, the contribution of the first lens E100 to thetotal effective focal length may be effectively controlled, and thetotal effective focal length may be a relatively large value to achievethe characteristics of an ultra-long focal length.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: −3.5<F1/f2<−3.0, whereF1 is a total effective focal length of the telephoto optical imagingsystem, and f2 is an effective focal length of the second lens E200.More specifically, F1 and f2 may satisfy: −3.2<F1/f2<−3.15. Bycontrolling the ratio of the total effective focal length to theeffective focal length of the second lens E200, the contribution of thesecond lens E200 to the total effective focal length may be effectivelycontrolled, and the total effective focal length may be a relativelylarge value to achieve the characteristics of an ultra-long focallength.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 2.0<EPD/ImgH<3.0, whereEPD is an entrance pupil diameter of the telephoto optical imagingsystem, and ImgH is half of a diagonal length of an effective pixel areaon an imaging plane S112 of the telephoto optical imaging system. Morespecifically, EPD and ImgH may satisfy: 2.20<EPD/ImgH<2.70. Bycontrolling the ratio of the entrance pupil diameter to the image heightof the telephoto optical imaging system, it is beneficial for thetelephoto optical imaging system to achieve large aperture and highimage quality, and have a relatively large field-of-view.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 1.65<(N1+N2)/2<1.80,where N1 is a refractive index of the first lens E100, and N2 is arefractive index of the second lens E200. More specifically, N1 and N2may satisfy: 1.69<(N1+N2)/2<1.73. By reasonably selecting the materialof the first lens E100 and the material of the second lens E200, therefractive index of the first lens E100 and the refractive index of thesecond lens E200 can be controlled. In addition, when the ratio of thetwo refractive indices satisfies the aforementioned conditionalexpression, the telephoto optical imaging system has the effects of highimage quality and small aberrations.

In an exemplary embodiment, the telephoto optical imaging systemaccording to the present disclosure may satisfy: 2.0<Tp<3.0, where Tp isa spaced interval along the optical axis between the exit surface S108of the optical path turning prism P1 and the incident surface S109 ofthe triangular prism P2. More specifically, Tp may satisfy:2.30<Tp<2.85. By controlling the air interval between the optical pathturning prism P1 and the triangular prism P2, a certain moving space isgiven to the image plane S112, so that the telephoto optical imagingsystem has better assembly processability, and the telephoto opticalimaging system is more compact and more miniaturized.

The optical imaging system according to the above embodiments of thepresent disclosure may employ a plurality of lenses, such as two lensesas described above. By properly configuring the refractive power of eachlens, the surface shape, the center thickness of each lens, and spacedintervals along the optical axis between the lenses, the size and thesensitivity of the imaging system may be effectively reduced, and theworkability of the imaging system may be improved, such that the opticalimaging system is more advantageous for production processing and may beapplied to portable electronic products. At the same time, the opticalimaging system of the present disclosure also has excellent opticalperformance such as an ultra-long effective focal length.

In the embodiments of the present disclosure, at least one of thesurfaces of lenses is aspheric, that is, at least one of the object-sidesurface S101 of the first lens E100 and the image-side surface S104 ofthe second lens E200 is aspheric. The aspheric lens is characterized bya continuous change in curvature from the center of the lens to theperiphery of the lens. Unlike a spherical lens having a constantcurvature from the center of the lens to the periphery of the lens, theaspheric lens has a better curvature radius characteristic, and has theadvantages of improving distortion aberration and improving astigmaticaberration. With aspheric lens, the aberrations that occur duringimaging may be eliminated as much as possible, and thus improving theimage quality. Optionally, at least one of the object-side surface andthe image-side surface of each of the first lens and the second lens isaspheric. Optionally, the object-side surface and the image-side surfaceof each of the first lens and the second lens are aspheric.

The present disclosure further provides a zoom camera apparatus whichincludes, the telephoto optical imaging system according to theforegoing embodiments and the combined embodiments, and a short-focusoptical imaging system. The short-focus optical imaging system and thetelephoto optical imaging system are arranged in parallel, and both maytake images of the same object side. The zoom camera apparatus hascompact structure, small size, and good image quality.

In an exemplary embodiment, the zoom camera apparatus according to thepresent disclosure may satisfy: F1/F2>5, where F1 is a total effectivefocal length of the telephoto optical imaging system, and F2 is a totaleffective focal length of the short-focus optical imaging system. Morespecifically, F1 and F2 may satisfy: F1/F2>7. By reasonably controllingthe ratio of the total effective focal length of the two optical imagingsystems, the zoom camera apparatus has a good zoom telephoto function.

In an exemplary embodiment, the short-focus optical imaging system mayhave seven lenses. In an exemplary embodiment, the above short-focusoptical imaging system may further include at least a stop. The stop maybe disposed at an appropriate position as required, for example, betweenthe lens closest to the object side and the object side. Optionally, theabove short-focus optical imaging system may further include an opticalfilter for correcting the color deviation and/or a protective glass forprotecting the photosensitive element located on an imaging plane.

The short-focus optical imaging system according to the aboveembodiments of the present disclosure may employ a plurality of lenses,such as seven lenses as described above. By properly configuring therefractive power of each lens, the surface shape, the center thicknessof each lens, and spaced intervals along the optical axis between thelenses, the size and the sensitivity of the imaging system may beeffectively reduced, and the workability of the imaging system may beimproved, such that the optical imaging system is more advantageous forproduction processing. In some embodiments of the present disclosure, atleast one of the surfaces of each lens of the short-focus opticalimaging system is aspheric. Optionally, the object-side surface and theimage-side surface of each lens are aspheric.

However, it will be understood by those skilled in the art that thenumber of lenses constituting the telephoto optical imaging system andthe number of lenses constituting the short-focus optical imaging systemmay be varied to achieve the various results and advantages described inthis specification without departing from the technical solution claimedby the present disclosure. It is also possible to install more opticalimaging systems in the zoom camera apparatus.

Some specific examples of optical imaging systems applicable to theabove embodiment will be further described below with reference to theaccompanying drawings. In the following examples, examples 1 to 3 relateto the telephoto optical imaging system as described above, and examples4 to 5 relate to the short-focus optical imaging system as describedabove. The examples provided in the present disclosure have consideredthe compatibility between each other. In other words, the followingtelephoto optical imaging system and short-focus optical imaging systemof the present disclosure may be arbitrarily combined with each other toachieve a desired zoom camera apparatus.

Example 1

A telephoto optical imaging system according to example 1 of the presentdisclosure is described below with reference to FIG. 2 to FIG. 3D. FIG.2 shows a schematic structural view of the telephoto optical imagingsystem according to example 1 of the present disclosure.

As shown in FIG. 2, the telephoto optical imaging system includes afirst lens E100, a second lens E200, an optical path turning prism P1and a triangular prism P2, which are sequentially arranged from anobject side to an image side along an optical axis.

The first lens E100 has positive refractive power, an object-sidesurface S101 thereof is a convex surface, and an image-side surface S102thereof is a concave surface. The second lens E200 has negativerefractive power, an object-side surface S103 thereof is a concavesurface, and an image-side surface S104 thereof is a concave surface. Anincident surface S105 of the optical path turning prism P1 to an exitsurface S111 of the triangular prism P2 are all spherical surfaces withinfinite radius of curvature. Light from an object sequentially passesthrough the respective surfaces S101 to S111 and is finally imaged on animaging plane S112 of the telephoto optical imaging system. A stop maybe disposed at the object-side surface S101 of the first lens E100.

Table 1 is a table illustrating basic parameters of the telephotooptical imaging system of example 1, wherein the units for the radius ofcurvature, the thickness/distance and the focal length are millimeter(mm).

TABLE 1 Material Surface Surface Radius of Thickness/ Refractive AbbeFocal Conic number type curvature Distance index number lengthcoefficient OBJ Spherical Infinite Infinite S101 Aspheric 9.7394 2.29001.743 49.34 13.58 0.9746 S102 Aspheric 226.0884 1.1466 0.0000 S103Aspheric −16.8016 1.5634 1.689 31.08 −15.00 −3.4922 S104 Aspheric28.3019 2.0000 0.0000 S105 Spherical Infinite 10.8640 1.517 64.17 S106Spherical Infinite −9.0000 1.517 64.17 S107 Spherical Infinite 10.86401.517 64.17 S108 Spherical Infinite 2.3654 S109 Spherical Infinite4.0000 1.517 64.17 S110 Spherical Infinite −4.0000 1.517 64.17 S111Spherical Infinite −7.2446 S112 Spherical Infinite

In example 1, a total effective focal length F1 of the telephoto opticalimaging system is 47.70 mm, and half of a diagonal length ImgH of aneffective pixel area on the imaging plane S112 of the telephoto opticalimaging system is 3.17 mm.

In example 1, the object-side surface and the image-side surface of anyone of the first lens E100 to the second lens E200 are aspheric. Thesurface shape x₁ of each aspheric lens may be defined by using, but notlimited to, the following aspheric formula:

$\begin{matrix}{x_{1} = {\frac{c_{1}m_{1}^{2}}{1 + \sqrt{1 - {\left( {k_{1} + 1} \right)c_{1}^{2}m_{1}^{2}}}} + {\sum{Aim}_{1}^{i}}}} & (1)\end{matrix}$

Where, x₁ is the sag—the axis-component of the displacement of thesurface from the aspheric vertex, when the surface is at height m₁ fromthe optical axis; c₁ is a paraxial curvature of the aspheric surface,c₁=1/R1 (that is, the paraxial curvature c₁ is reciprocal of the radiusof curvature R1 in the above Table 1); k₁ is a conic coefficient; Ai isa correction coefficient for the i-th order of the aspheric surface.Table 2 below shows high-order coefficients A4, A6, A8 and A10applicable to each aspheric surface S101 to S104 in example 1.

TABLE 2 Surface number A4 A6 A8 A10 S1 5.8243E−05 −7.5436E−07 5.2773E−08−2.3047E−09  S2 5.2876E−04 −4.3133E−06 −5.2751E−07  7.8582E−09 S31.9158E−03 −8.0799E−05 1.0799E−06 −2.9290E−09  S4 1.8337E−03 −5.2936E−056.3900E−07 2.0478E−08

FIG. 3A illustrates a longitudinal aberration curve of the telephotooptical imaging system according to example 1, representing deviationsof focal points converged by light of different wavelengths afterpassing through the system. FIG. 3B illustrates an astigmatic curve ofthe telephoto optical imaging system according to example 1,representing a curvature of a tangential plane and a curvature of asagittal plane. FIG. 3C illustrates a distortion curve of the telephotooptical imaging system according to example 1, representing amounts ofdistortion corresponding to different field-of-views. FIG. 3Dillustrates a lateral color curve of the telephoto optical imagingsystem according to example 1, representing deviations of differentimage heights on an imaging plane after light passes through the system.It can be seen from FIG. 3A to FIG. 3D that the telephoto opticalimaging system provided in example 1 may achieve good image quality.

Example 2

A telephoto optical imaging system according to example 2 of the presentdisclosure is described below with reference to FIG. 4 to FIG. 5D. Inthis example and the following examples, for the purpose of brevity, thedescription of parts similar to those in example 1 will be omitted. FIG.4 shows a schematic structural view of the telephoto optical imagingsystem according to example 2 of the present disclosure.

As shown in FIG. 4, the telephoto optical imaging system includes afirst lens E100, a second lens E200, an optical path turning prism P1and a triangular prism P2, which are sequentially arranged from anobject side to an image side along an optical axis.

The first lens E100 has positive refractive power, an object-sidesurface S101 thereof is a convex surface, and an image-side surface S102thereof is a concave surface. The second lens E200 has negativerefractive power, an object-side surface S103 thereof is a concavesurface, and an image-side surface S104 thereof is a concave surface. Anincident surface S105 of the optical path turning prism P1 to an exitsurface S111 of the triangular prism P2 are all spherical surfaces withinfinite radius of curvature. Light from an object sequentially passesthrough the respective surfaces S101 to S111 and is finally imaged on animaging plane S112 of the telephoto optical imaging system. A stop maybe disposed at the object-side surface S101 of the first lens E100.

In example 2, a total effective focal length F1 of the telephoto opticalimaging system is 52.47 mm, and half of a diagonal length ImgH of aneffective pixel area on the imaging plane S112 of the telephoto opticalimaging system is 3.49 mm.

Table 3 is a table illustrating basic parameters of the telephotooptical imaging system of example 2, wherein the units for the radius ofcurvature, the thickness/distance and the focal length are millimeter(mm). Table 4 shows high-order coefficients applicable to each asphericsurface in example 2, wherein the surface shape of each aspheric surfacemay be defined by the formula (1) given in the above example 1.

TABLE 3 Material Surface Surface Radius of Thickness/ Refractive AbbeFocal Conic number type curvature Distance index number lengthcoefficient OBJ Spherical Infinite Infinite S101 Aspheric 10.7134 2.51901.743 49.34 14.94 0.9746 S102 Aspheric 248.6972 1.2613 0.0000 S103Aspheric −18.4818 1.7197 1.689 31.08 −16.50 −3.4922 S104 Aspheric31.1321 2.2000 0.0000 S105 Spherical Infinite 11.9504 1.517 64.17 S106Spherical Infinite −9.9000 1.517 64.17 S107 Spherical Infinite 11.95041.517 64.17 S108 Spherical Infinite 2.6020 S109 Spherical Infinite4.4000 1.517 64.17 S110 Spherical Infinite −4.4000 1.517 64.17 S111Spherical Infinite −7.9691 S112 Spherical Infinite

TABLE 4 Surface number A4 A6 A8 A10 S1 4.3759E−05 −4.6840E−07 2.7081E−08−9.7741E−10  S2 3.9727E−04 −2.6782E−06 −2.7070E−07  3.3326E−09 S31.4394E−03 −5.0170E−05 5.5416E−07 −1.2422E−09  S4 1.3777E−03 −3.2869E−053.2791E−07 8.6848E−09

FIG. 5A illustrates a longitudinal aberration curve of the telephotooptical imaging system according to example 2, representing deviationsof focal points converged by light of different wavelengths afterpassing through the system. FIG. 5B illustrates an astigmatic curve ofthe telephoto optical imaging system according to example 2,representing a curvature of a tangential plane and a curvature of asagittal plane. FIG. 5C illustrates a distortion curve of the telephotooptical imaging system according to example 2, representing amounts ofdistortion corresponding to different field-of-views. FIG. 5Dillustrates a lateral color curve of the telephoto optical imagingsystem according to example 2, representing deviations of differentimage heights on an imaging plane after light passes through the system.It can be seen from FIG. 5A to FIG. 5D that the telephoto opticalimaging system provided in example 2 may achieve good image quality.

Example 3

A telephoto optical imaging system according to example 3 of the presentdisclosure is described below with reference to FIG. 6 to FIG. 7D. FIG.6 shows a schematic structural view of the telephoto optical imagingsystem according to example 3 of the present disclosure.

As shown in FIG. 6, the telephoto optical imaging system includes afirst lens E100, a second lens E200, an optical path turning prism P1and a triangular prism P2, which are sequentially arranged from anobject side to an image side along an optical axis.

The first lens E100 has positive refractive power, an object-sidesurface S101 thereof is a convex surface, and an image-side surface S102thereof is a concave surface. The second lens E200 has negativerefractive power, an object-side surface S103 thereof is a concavesurface, and an image-side surface S104 thereof is a concave surface. Anincident surface S105 of the optical path turning prism P1 to an exitsurface S111 of the triangular prism P2 are all spherical surfaces withinfinite radius of curvature. Light from an object sequentially passesthrough the respective surfaces S101 to S111 and is finally imaged on animaging plane S112 of the telephoto optical imaging system. A stop maybe disposed at the object-side surface S101 of the first lens E100.

In example 3, a total effective focal length F1 of the telephoto opticalimaging system is 52.47 mm, and half of a diagonal length ImgH of aneffective pixel area on the imaging plane S112 of the telephoto opticalimaging system is 3.80 mm.

Table 5 is a table illustrating basic parameters of the telephotooptical imaging system of example 3, wherein the units for the radius ofcurvature, the thickness/distance and the focal length are millimeter(mm). Table 6 shows high-order coefficients applicable to each asphericsurface in example 3, wherein the surface shape of each aspheric surfacemay be defined by the formula (1) given in the above example 1.

TABLE 5 Material Surface Surface Radius of Thickness/ Refractive AbbeFocal Conic number type curvature Distance index number lengthcoefficient OBJ Spherical Infinite Infinite S101 Aspheric 11.6873 2.74801.743 49.34 16.30 0.9746 S102 Aspheric 271.3061 1.3759 0.0000 S103Aspheric −20.1619 1.8761 1.689 31.08 −18.00 −3.4922 S104 Aspheric33.9623 2.4000 0.0000 S105 Spherical Infinite 13.0368 1.517 64.17 S106Spherical Infinite −10.8000 1.517 64.17 S107 Spherical Infinite 13.03681.517 64.17 S108 Spherical Infinite 2.8385 S109 Spherical Infinite4.8000 1.517 64.17 S110 Spherical Infinite −4.8000 1.517 64.17 S111Spherical Infinite −8.6935 S112 Spherical Infinite

TABLE 6 Surface number A4 A6 A8 A10 S1 3.3706E−05 −3.0316E−07 1.4728E−08−4.4666E−10  S2 3.0600E−04 −1.7334E−06 −1.4722E−07  1.5230E−09 S31.1087E−03 −3.2471E−05 3.0138E−07 −5.6766E−10  S4 1.0612E−03 −2.1274E−051.7833E−07 3.9688E−09

FIG. 7A illustrates a longitudinal aberration curve of the telephotooptical imaging system according to example 3, representing deviationsof focal points converged by light of different wavelengths afterpassing through the system. FIG. 7B illustrates an astigmatic curve ofthe telephoto optical imaging system according to example 3,representing a curvature of a tangential plane and a curvature of asagittal plane. FIG. 7C illustrates a distortion curve of the telephotooptical imaging system according to example 3, representing amounts ofdistortion corresponding to different field-of-views. FIG. 7Dillustrates a lateral color curve of the telephoto optical imagingsystem according to example 3, representing deviations of differentimage heights on an imaging plane after light passes through the system.It can be seen from FIG. 7A to FIG. 7D that the telephoto opticalimaging system provided in example 3 may achieve good image quality.

In view of the above, examples 1 to 3 respectively satisfy therelationship shown in Table 7.

TABLE 7 Condition/ Example 1 2 3 TL/T 3.44 3.44 3.44 T/F1 0.48 0.48 0.48H/D1 2.66 2.92 3.18 |tanβ|/h 0.27 0.24 0.22 h/D2 1.28 1.30 1.42 f/f13.51 3.51 3.51 f/f2 −3.18  −3.18  −3.18  EPD/ImgH 2.68 2.44 2.23 (N1 +N2)/2 1.72 1.72 1.72 Tp 2.37 2.60 2.84

Some specific examples of a zoom camera apparatus applicable to theabove embodiment will be further described below with reference to theaccompanying drawings.

Example 4

A zoom camera apparatus of this example may include one of the telephotooptical imaging systems in the foregoing embodiments and in examples 1to 3, and further include a short-focus optical imaging system.

A short-focus optical imaging system according to example 4 of thepresent disclosure is described below with reference to FIG. 8 to FIG.9D. FIG. 8 shows a schematic structural view of the short-focus opticalimaging system according to example 4 of the present disclosure.

As shown in FIG. 8, the short-focus optical imaging system includes astop STO, a third lens E1, a fourth lens E2, a fifth lens E3, a sixthlens E4, a seventh lens E5, an eighth lens E6, a ninth lens E7 and anoptical filter E8, which are sequentially arranged from an object sideto an image side along an optical axis.

The third lens E1 has positive refractive power, an object-side surfaceS1 thereof is a convex surface, and an image-side surface S2 thereof isa concave surface. The fourth lens E2 has negative refractive power, anobject-side surface S3 thereof is a convex surface, and an image-sidesurface S4 thereof is a concave surface. The fifth lens E3 has negativerefractive power, an object-side surface S5 thereof is a concavesurface, and an image-side surface S6 thereof is a convex surface. Thesixth lens E4 has positive refractive power, an object-side surface S7thereof is a concave surface, and an image-side surface S8 thereof is aconvex surface. The seventh lens E5 has positive refractive power, anobject-side surface S9 thereof is a concave surface, and an image-sidesurface S10 thereof is a convex surface. The eighth lens E6 has positiverefractive power, an object-side surface S11 thereof is a concavesurface, and an image-side surface S12 thereof is a convex surface. Theninth lens E7 has negative refractive power, an object-side surface S13thereof is a concave surface, and an image-side surface S14 thereof is aconcave surface. The optical filter E8 has an object-side surface S15and an image-side surface S16. Light from an object sequentially passesthrough the respective surfaces S1 to S16 and is finally imaged on animaging plane S17 of the short-focus optical imaging system.

In example 4, a total effective focal length F2 of the short-focusoptical imaging system is 6.70 mm, and half of a diagonal length ImgH ofan effective pixel area on the imaging plane S17 of the short-focusoptical imaging system is 6.40 mm. When the zoom camera apparatus ofthis example employs the telephoto optical imaging system in example 1,the zoom ratio is 7.12.

Table 8 is a table illustrating basic parameters of the short-focusoptical imaging system of example 4, wherein the units for the radius ofcurvature, the thickness/distance and the focal length are millimeter(mm).

TABLE 8 Material Surface Surface Radius of Thickness/ Refractive AbbeFocal Conic number type curvature Distance index number lengthcoefficient OBJ Spherical Infinite Infinite STO Spherical Infinite−0.6850 S1 Aspheric 2.3193 0.9000 1.546 56.11 5.19 −0.011 S2 Aspheric13.1178 0.0515 15.136 S3 Aspheric 6.7331 0.2901 1.678 19.25 −12.40 0.000S4 Aspheric 3.5877 0.4284 0.000 S5 Aspheric −9.3507 0.3817 1.678 19.25−43.07 0.000 S6 Aspheric −17.7650 0.1461 0.000 S7 Aspheric −27.70630.5729 1.546 56.11 32.03 0.000 S8 Aspheric −6.4090 0.5210 0.000 S9Aspheric −4.3038 0.4100 1.570 37.31 81.14 0.000 S10 Aspheric −8.08110.6505 0.000 S11 Aspheric −9.8694 0.5300 1.546 56.11 17.52 0.000 S12Aspheric −9.8550 0.8759 0.805 S13 Aspheric −11.7165 0.8100 1.536 55.74−6.31 0.000 S14 Aspheric 5.4470 0.3729 0.121 S15 Spherical Infinite0.2100 1.517 64.20 S16 Spherical Infinite 0.4190 S17 Spherical Infinite

In example 4, the object-side surface and the image-side surface of anyone of the third lens E1 to the ninth lens E7 are aspheric. The surfaceshape x₂ of each aspheric lens may be defined by using, but not limitedto, the following aspheric formula:

$\begin{matrix}{x_{2} = {\frac{c_{2}m_{2}^{2}}{1 + \sqrt{1 - {\left( {k_{2} + 1} \right)c_{2}^{2}m_{2}^{2}}}} + {\sum{Bim}_{2}^{i}}}} & (2)\end{matrix}$

Where, x₂ is the sag—the axis-component of the displacement of thesurface from the aspheric vertex, when the surface is at height m₂ fromthe optical axis; c₂ is a paraxial curvature of the aspheric surface,c₂=1/R2 (that is, the paraxial curvature c₂ is reciprocal of the radiusof curvature R2 in the above Table 8); k₂ is a conic coefficient; Bi isa correction coefficient for the i-th order of the aspheric surface.Table 9 below shows high-order coefficients B4, B6, B8, B10, B12, B14,B16, B18 and B20 applicable to each aspheric surface S1 to S14 inexample 4.

TABLE 9 Surface number B4 B6 B8 B10 B12 B14 B16 B18 B20 S1 −8.4271E−03−1.6373E−03  1.4022E−03 −5.1051E−04  1.5227E−04 −5.1006E−05  2.1046E−05−6.6965E−06  5.2334E−06 S2 −2.0807E−02  3.5852E−03  1.1982E−03 1.2762E−03  2.6435E−04  2.9637E−04 −5.0860E−05  7.3553E−05 −1.3804E−05S3 −9.6169E−02  2.1992E−02 −3.6468E−03  2.7382E−03 −1.4150E−04 4.1701E−04 −1.0682E−04  8.3109E−05 −2.1289E−05 S4 −5.9474E−02 1.1641E−02 −2.8163E−03  1.5481E−03 −4.5618E−04  2.7761E−04 −1.2172E−04 5.8302E−05 −1.5282E−05 S5  6.5631E−02  3.7679E−03 −1.8356E−03 5.0585E−04 −1.1830E−04  1.1111E−04 −6.8334E−05  3.1712E−05 −9.3756E−06S6 −2.7204E−02  4.3034E−02 −1.0201E−02  1.3290E−03  9.4051E−05 1.0239E−04 −7.3964E−05  5.0447E−05 −1.5216E−05 S7 −6.4914E−02 7.4840E−02 −5.7584E−03 −6.6374E−03  2.7704E−03  1.7981E−04 −2.0616E−04 5.3663E−05  2.6793E−05 S8  1.9111E−02  1.4531E−01 −6.9459E−02 1.8346E−02  1.2157E−03 −3.5439E−03  2.3029E−03 −7.7473E−04  1.5122E−04S9  7.5932E−01  7.8930E−02 −9.5168E−02  6.3922E−02 −3.0589E−02 1.4630E−02 −4.1668E−03  8.0841E−04 −1.4083E−04 S10  2.4891E−02 1.4643E−01  1.2972E−01 −2.2891E−02 −2.1407E−02  9.3133E−03  8.1198E−03−1.7355E−03 −7.8068E−04 S11 −4.9777E−01  8.5581E−01  4.9509E−01−1.0423E−01 −1.5718E−01  5.5216E−03  6.1221E−02  3.5340E−03 −1.5464E−02S12 −9.8457E−03  7.4299E−01  8.2398E−02  1.6289E−01 −2.3109E−02−1.2227E−01  3.6826E−02  1.5341E−02  3.9560E−03 S13 −1.7940E+00−6.6226E−01 −6.6294E−02  1.8543E−01  2.8473E−01  1.7655E−01  2.4170E−02−3.5435E−02 −3.4661E−02 S14 −5.7893E+00  1.0611E+00 −3.6441E−01 7.5989E−02 −8.0817E−02  3.1960E−03  9.5569E−03 −1.2997E−02  1.0727E−03

FIG. 9A illustrates a longitudinal aberration curve of the short-focusoptical imaging system according to example 4, representing deviationsof focal points converged by light of different wavelengths afterpassing through the system. FIG. 9B illustrates an astigmatic curve ofthe short-focus optical imaging system according to example 4,representing a curvature of a tangential plane and a curvature of asagittal plane. FIG. 9C illustrates a distortion curve of theshort-focus optical imaging system according to example 4, representingamounts of distortion corresponding to different image heights. FIG. 9Dillustrates a lateral color curve of the short-focus optical imagingsystem according to example 4, representing deviations of differentimage heights on an imaging plane after light passes through the system.It can be seen from FIG. 9A to FIG. 9D that the short-focus opticalimaging system provided in example 4 may achieve good image quality. Thezoom camera apparatus has better image quality.

Example 5

A zoom camera apparatus of this example may include one of the telephotooptical imaging systems in the foregoing embodiments and in examples 1to 3, and further include a short-focus optical imaging system.

A short-focus optical imaging system according to example 5 of thepresent disclosure is described below with reference to FIG. 10 to FIG.11D. FIG. 10 shows a schematic structural view of the short-focusoptical imaging system according to example 5 of the present disclosure.

As shown in FIG. 10, the short-focus optical imaging system includes astop STO, a third lens E1, a fourth lens E2, a fifth lens E3, a sixthlens E4, a seventh lens E5, an eighth lens E6, a ninth lens E7 and anoptical filter E8, which are sequentially arranged from an object sideto an image side along an optical axis.

The third lens E1 has positive refractive power, an object-side surfaceS1 thereof is a convex surface, and an image-side surface S2 thereof isa concave surface. The fourth lens E2 has negative refractive power, anobject-side surface S3 thereof is a convex surface, and an image-sidesurface S4 thereof is a concave surface. The fifth lens E3 has negativerefractive power, an object-side surface S5 thereof is a concavesurface, and an image-side surface S6 thereof is a convex surface. Thesixth lens E4 has positive refractive power, an object-side surface S7thereof is a concave surface, and an image-side surface S8 thereof is aconvex surface. The seventh lens E5 has negative refractive power, anobject-side surface S9 thereof is a concave surface, and an image-sidesurface S10 thereof is a convex surface. The eighth lens E6 has positiverefractive power, an object-side surface S11 thereof is a concavesurface, and an image-side surface S12 thereof is a convex surface. Theninth lens E7 has negative refractive power, an object-side surface S13thereof is a concave surface, and an image-side surface S14 thereof is aconvex surface. The optical filter E8 has an object-side surface S15 andan image-side surface S16. Light from an object sequentially passesthrough the respective surfaces S1 to S16 and is finally imaged on animaging plane S17 of the short-focus optical imaging system.

In example 5, a total effective focal length F2 of the short-focusoptical imaging system is 6.63 mm, and half of a diagonal length ImgH ofan effective pixel area on the imaging plane S17 of the short-focusoptical imaging system is 6.40 mm. When the zoom camera apparatus ofthis example employs the telephoto optical imaging system in example 3,the zoom ratio is 8.63.

Table 10 is a table illustrating basic parameters of the short-focusoptical imaging system of example 5, wherein the units for the radius ofcurvature, the thickness/distance and the focal length are millimeter(mm). Table 11 shows high-order coefficients applicable to each asphericsurface in example 5, wherein the surface shape of each aspheric surfacemay be defined by the formula (2) given in the above example 4.

TABLE 10 Material Surface Surface Radius of Thickness/ Refractive AbbeFocal Conic number type curvature Distance index number lengthcoefficient OBJ Spherical Infinite Infinite STO Spherical Infinite−0.6375 S1 Aspheric 2.3975 0.8682 1.546 56.11 5.45 0.000 S2 Aspheric12.4601 0.0742 0.000 S3 Aspheric 6.1900 0.3162 1.678 19.25 −12.25 0.000S4 Aspheric 3.4819 0.3681 0.000 S5 Aspheric −12.0814 0.3072 1.678 19.25−151.80 0.000 S6 Aspheric −24.0308 0.2227 0.000 S7 Aspheric −43.21210.5193 1.546 56.11 33.70 0.000 S8 Aspheric −11.4032 0.8577 0.000 S9Aspheric −7.2989 0.5000 1.570 37.31 −24.21 0.000 S10 Aspheric −8.56840.3215 0.000 S11 Aspheric −8.7152 0.6745 1.546 56.11 8.26 0.000 S12Aspheric −8.0404 0.9877 0.000 S13 Aspheric −8.7596 0.5100 1.536 55.74−5.69 0.000 S14 Aspheric −9.6724 0.2805 0.000 S15 Spherical Infinite0.2142 1.517 64.20 S16 Spherical Infinite 0.5061 S17 Spherical Infinite

TABLE 11 Surface number B4 B6 B8 B10 B12 B14 B16 B18 B20 S1  5.6361E−02−2.5411E−02  1.0980E−02 −4.0092E−03  1.4335E−03 −4.6916E−04  1.3796E−04−3.8318E−05  1.5599E−05 S2  3.5558E−02 −1.4845E−02  8.5170E−03 6.8749E−04 −2.1106E−03  2.2775E−03 −1.3842E−03  6.7742E−04 −1.9075E−04S3 −1.3648E−01  2.7687E−02 −2.4111E−03  1.7501E−03 −9.3695E−04 1.1322E−03 −6.2394E−04  2.7954E−04 −6.9536E−05 S4 −6.2308E−02 8.4439E−04  6.8300E−03 −5.1738E−03  3.3458E−03 −1.5471E−03  6.0732E−04−1.6555E−04  2.1288E−05 S5  1.0734E−01 −9.0074E−03  4.9558E−03−4.1453E−03  2.7900E−03 −1.3479E−03  5.5902E−04 −1.8693E−04  4.0548E−05S6  1.6760E−02  1.9690E−02 −5.0720E−03  8.0396E−04  1.1187E−04−8.6118E−06 −1.0049E−05  8.0415E−06  2.0557E−06 S7 −6.5241E−02 5.4548E−02  8.4862E−03 −7.7361E−03  5.2207E−04  1.1776E−03 −2.0857E−04−1.7429E−04  9.2362E−05 S8 −9.4224E−02  9.4117E−02  1.8981E−03−1.3769E−02  5.0277E−03  2.0003E−04 −6.7281E−04  2.3613E−04 −1.1619E−05S9  3.5438E−01  2.9640E−01 −1.0309E−01 −3.3219E−02  4.1182E−02−8.8540E−03 −7.6102E−05  1.0094E−03 −1.4277E−04 S10  2.1149E−01 2.0937E−01  1.5325E−01 −6.3021E−02  8.5556E−03  1.8973E−02  8.6358E−03−6.2928E−03  1.4695E−03 S11  6.1356E−01  7.0924E−01  2.1251E−01−1.8725E−01  3.0854E−02  2.7427E−02 −1.1693E−03 −1.6920E−02  6.5317E−03S12  3.9446E−01  7.6954E−01 −7.1193E−02  6.5055E−02 −7.5268E−03−6.0853E−02  2.2553E−02 −1.5976E−02 −5.9630E−04 S13 −1.6888E+00−5.4395E−01 −2.8075E−02  1.0801E−01  2.2405E−01  1.3204E−01  1.0985E−02−3.4605E−03 −1.9508E−03 S14  1.2715E−01  9.7808E−02  1.8733E−01−1.9956E−02  2.3852E−01  4.9957E−02  3.3977E−02  6.6821E−02 −3.2301E−02

FIG. 11A illustrates a longitudinal aberration curve of the short-focusoptical imaging system according to example 5, representing deviationsof focal points converged by light of different wavelengths afterpassing through the system. FIG. 11B illustrates an astigmatic curve ofthe short-focus optical imaging system according to example 5,representing a curvature of a tangential plane and a curvature of asagittal plane. FIG. 11C illustrates a distortion curve of theshort-focus optical imaging system according to example 5, representingamounts of distortion corresponding to different image heights. FIG. 11Dillustrates a lateral color curve of the short-focus optical imagingsystem according to example 5, representing deviations of differentimage heights on an imaging plane after light passes through the system.It can be seen from FIG. 11A to FIG. 11D that the short-focus opticalimaging system provided in example 5 may achieve good image quality. Thezoom camera apparatus has better image quality.

The present disclosure further provides a zoom camera apparatus, whichis provided with an electronic photosensitive element for imaging. Theelectronic photosensitive element may be a photosensitive Charge-CoupledDevice (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS). Thezoom camera apparatus may be an independent imaging device such as adigital camera, or may be an imaging module integrated in a mobileelectronic device such as a mobile phone. The imaging apparatus isequipped with the optical imaging system described above.

The foregoing is only a description of the preferred examples of thepresent disclosure and the applied technical principles. It should beappreciated by those skilled in the art that the protective scope of thepresent disclosure is not limited to the technical solutions formed bythe particular combinations of the above technical features. Theprotective scope should also cover other technical solutions formed byany combinations of the above technical features or equivalent featuresthereof without departing from the concept of the invention, such as,technical solutions formed by replacing the features as disclosed in thepresent disclosure with (but not limited to), technical features withsimilar functions.

What is claimed is:
 1. A telephoto optical imaging system, sequentiallyfrom an object side to an image side of the telephoto optical imagingsystem along an optical axis, comprising: a first lens having positiverefractive power; a second lens having negative refractive power; anoptical path turning prism, wherein an incident surface of the opticalpath turning prism is perpendicular to an axis of the second lens, anexit surface of the optical path turning prism is perpendicular to theincident surface of the optical path turning prism, and wherein animaging light incident to the optical path turning prism along theoptical axis is reflected sequentially at a first optical path turningsurface of the optical path turning prism and a second optical pathturning surface of the optical path turning prism and emittedperpendicularly from the exit surface of the optical path turning prism;and a triangular prism, wherein the light perpendicularly emitted fromthe exit surface of the optical path turning prism is reflected at areflecting surface of the triangular prism and deflected by 90° with adeflection direction toward the image side; wherein F1>40 mm, where F1is a total effective focal length of the telephoto optical imagingsystem.
 2. The telephoto optical imaging system according to claim 1,wherein 3.0<TL/T<4.0, where TL is an equivalent distance in the air fora path distance of the light traveling along the optical axis from theobject-side surface of the first lens to an imaging plane of thetelephoto optical imaging system, and T is a distance from theobject-side surface of the first lens to the imaging plane of thetelephoto optical imaging system in a normal direction of the imagingplane of the telephoto optical imaging system.
 3. The telephoto opticalimaging system according to claim 1, wherein T/F1<0.6, where T is adistance from the object-side surface of the first lens to an imagingplane of the telephoto optical imaging system in a normal direction ofthe imaging plane of the telephoto optical imaging system, and F1 is thetotal effective focal length of the telephoto optical imaging system. 4.The telephoto optical imaging system according to claim 1, wherein thetelephoto optical imaging system has a height H in a directionperpendicular to the exit surface of the optical path turning prism, andwherein 2.5<H/D1<3.5, where H is the height of the telephoto opticalimaging system, and D1 is a maximum effective diameter of the firstlens.
 5. The telephoto optical imaging system according to claim 1,wherein 0.2≤|tan β|/h≤0.3, where β is an angle between the secondoptical path turning surface of the optical path turning prism and theincident surface of the optical path turning prism, and h is aneffective diameter of the incident surface of the optical path turningprism.
 6. The telephoto optical imaging system according to claim 1,wherein 1.0<h/D2<1.5, where h is an effective diameter of the incidentsurface of the optical path turning prism, and D2 is a maximum effectivediameter of the second lens.
 7. The telephoto optical imaging systemaccording to claim 1, wherein 3.0<F1/f1<4.0, where F1 is the totaleffective focal length of the telephoto optical imaging system, and f1is an effective focal length of the first lens.
 8. The telephoto opticalimaging system according to claim 1, wherein −3.5<F1/f2<−3.0, where F1is the total effective focal length of the telephoto optical imagingsystem, and f2 is an effective focal length of the second lens.
 9. Thetelephoto optical imaging system according to claim 1, wherein2.0<EPD/ImgH<3.0, where EPD is an entrance pupil diameter of thetelephoto optical imaging system, and ImgH is half of a diagonal lengthof an effective pixel area on an imaging plane of the telephoto opticalimaging system.
 10. The telephoto optical imaging system according toclaim 1, wherein 1.65<(N1+N2)/2<1.80, where N1 is a refractive index ofthe first lens, and N2 is a refractive index of the second lens.
 11. Thetelephoto optical imaging system according to claim 1, wherein2.0<Tp<3.0, where Tp is a spaced interval along the optical axis betweenthe exit surface of the optical path turning prism and the incidentsurface of the triangular prism.
 12. A telephoto optical imaging system,sequentially from an object side to an image side of the telephotooptical imaging system along an optical axis, comprising: a first lenshaving positive refractive power; a second lens having negativerefractive power; an optical path turning prism, wherein an incidentsurface of the optical path turning prism is perpendicular to an axis ofthe second lens, an exit surface of the optical path turning prism isperpendicular to the incident surface of the optical path turning prism,and wherein an imaging light incident to the optical path turning prismalong the optical axis is reflected sequentially at a first optical pathturning surface of the optical path turning prism and a second opticalpath turning surface of the optical path turning prism and emittedperpendicularly from the exit surface of the optical path turning prism;and a triangular prism, wherein the light perpendicularly emitted fromthe exit surface of the optical path turning prism is reflected at areflecting surface of the triangular prism and deflected by 90° with adeflection direction toward the image side; wherein 3.0<TL/T<4.0, whereTL is an equivalent distance in the air for a path distance of the lighttraveling along the optical axis from the object-side surface of thefirst lens to an imaging plane of the telephoto optical imaging system,and T is a distance from the object-side surface of the first lens tothe imaging plane of the telephoto optical imaging system in a normaldirection of the imaging plane of the telephoto optical imaging system.13. The telephoto optical imaging system according to claim 12, whereinT/F1<0.6, where T is a distance from the object-side surface of thefirst lens to an imaging plane of the telephoto optical imaging systemin a normal direction of the imaging plane of the telephoto opticalimaging system, and F1 is the total effective focal length of thetelephoto optical imaging system.
 14. The telephoto optical imagingsystem according to claim 12, wherein the telephoto optical imagingsystem has a height H in a direction perpendicular to the exit surfaceof the optical path turning prism, and wherein 2.5<H/D1<3.5, where H isthe height of the telephoto optical imaging system, and D1 is a maximumeffective diameter of the first lens.
 15. The telephoto optical imagingsystem according to claim 12, wherein 0.2≤|tan β|/h≤0.3, where β is anangle between the second optical path turning surface of the opticalpath turning prism and the incident surface of the optical path turningprism, and h is an effective diameter of the incident surface of theoptical path turning prism.
 16. The telephoto optical imaging systemaccording to claim 12, wherein 1.0<h/D2<1.5, where h is an effectivediameter of the incident surface of the optical path turning prism, andD2 is a maximum effective diameter of the second lens.
 17. The telephotooptical imaging system according to claim 12, wherein 3.0<F1/f1<4.0,where F1 is a total effective focal length of the telephoto opticalimaging system, and f1 is an effective focal length of the first lens.18. The telephoto optical imaging system according to claim 12, wherein−3.5<F1/f2<−3.0, where F1 is a total effective focal length of thetelephoto optical imaging system, and f2 is an effective focal length ofthe second lens.
 19. The telephoto optical imaging system according toclaim 12, wherein 2.0<EPD/ImgH<3.0, where EPD is an entrance pupildiameter of the telephoto optical imaging system, and ImgH is half of adiagonal length of an effective pixel area on the imaging plane of thetelephoto optical imaging system.
 20. A zoom camera apparatus,comprising: the telephoto optical imaging system according to claim 1;and a short-focus optical imaging system, arranged in parallel with thetelephoto optical imaging system, wherein F1/F2>5, where F1 is a totaleffective focal length of the telephoto optical imaging system, and F2is a total effective focal length of the short-focus optical imagingsystem.